add: license, third-party-notices (#18)

Author: AlrikOlson

LICENSE.txt

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+MIT License
+
+Copyright (c) 2024 Alrik Olson
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

THIRD-PARTY-NOTICES.txt

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+THIRD-PARTY-NOTICES
+
+This file lists the third-party software components used by D2Sharp.
+
+D2 (https://github.com/terrastruct/d2)
+License: Mozilla Public License 2.0
+License URL: https://mozilla.org/MPL/2.0/
+
+D2Sharp uses prebuilt binaries from D2, which is licensed under the Mozilla Public License 2.0. 
+The source code for D2 can be obtained from its GitHub repository at https://github.com/terrastruct/d2.
+
+For full license texts, please refer to the URLs provided above.